Diamides of methane-1:1-dicarboxylic acids



Patented Aug. 17, 1948 DIAMIDES OF METHAN E-1 l-DICARBOXYLIC ACIDS Henry Martin and Hans Gysin, Basel, Hans Zaeslin, Riehen, near Basel, and Alfred Margot, Basel, Switzerland, assignors to J. R. Geigy A. G., Basel, Switzerland, a Swiss firm No Drawing. Original application October 15,

1943, Serial No. 506,418. Divided and this application February 28, 1947, Serial No. 731,720. In Switzerland December 18, 1942 4 Claims. (Cl. 260557) This is a divisional patent application of our copending patent application Ser. No. 506,418 filed on October 15, 1943.

It has been found that amides deriving from substituted malonic acids and from secondary aliphatic and cycloaliphatic amines respectively containing at least 3 C-atoms constitute very valuable therapeutical compounds. As substituents being present in the methylene group of the malonic acid there come into question: alkyl, alkenyl, alkylene, alkylidene; cycloalkyl, cycloalkenyl and cycloalkylidene radicals. The cycloalkyl and cycloalkenyl radicals may be linked directly to the methylene group or by means of an aliphatic linking member.

As substituted malonic acids we may use for instance: dimethyl malonic acid, methyl ethyl malonic acid, diethyl malonic acid, allyl methyl malonic acid, propyl methyl malonic acid, isopropyl methyl malonic acid, isopropenyl methyl malonic acid, isopropylidene malonic acid; cyclohexyl-, cyclohexylmethyl-, cyclohexenyl-, cyclopentylidene-malonic acid; cyclopropane-, -butane-, -pentane-, -hexane-1:1-dicarboxylic acid.

The new malonic acid diamides disubstituted in the amide radical are obtained by causing a malonic acid of the above definition or a functional derivative thereof, such as for example a halide or an ester, to react according to known methods with secondaryaliphatic or cycloaliphatic amines containing at least 3 C-atoms or their salts, in the presence or absence of solvents, of condensation agents as well as of acid binding agents.- 7

As condensation agents there are advantageously used phosphorus halides, phosphorus pentoxide, thionyl chloride, phosgene and so on.

Another method consists in that the salts of the above defined malonic acids are caused to react with such carbamic acid halides which derive rrom secondary aliphatic or cycloaliphatic amines containing at least 3 C-atoms. Moreover in certain cases it will be possible to start from the amides oi the unsubstituted malonic acid, and to substitute the C-substituents into the methylene group of the malonic acid. 'The misslng substituents may also subsequently be introduced into amides which have been prepared by means of primary amines or ammonia instead of with'secondary amines (cf. Titherley J. Chem. Soc. London 79, 391 199.

The new compounds may be usedas valuable therapeutics, especially as analeptics; partly they are also suitable as solving assistants.

The present invention is illustrated, but not limited by the following examples, wherein the parts are by weight, unless otherwise stated. Parts by weight bear the same relation to parts by volume as do grams to cubic centimeters.

EXAMPLE 1 158 parts of methyl isopropenyl malonic acid are treated with 417 parts of phosphorus pentachloride and the whole is heated to C. After completion of the reaction the phosphorus oxychloride is removed and the carboxylic acid chloride distilled, B. P. -80 C. at 15 mm. Then the acid chloride is allowed to drop while well cooling into a little excess of diethylamine in dry ether. The diethylamine hydrochloride thus separated is filtered by suction and the residue after havin expelled the solvent is freed from remaining diethylamine hydrochloride by means of potassium hydroxide or of potassium carbonate and finally rectified in high vacuo. The obtained methyl isopropenyl malonic acid bis-diethylamide has a boiling point of 109110 C. at 0.12 mm. pressure. When recrystallized from petroleum ether the new amide melts at 48-49 0.; it is soluble in water for about 4 per cent, but easily soluble in ether.

EXAMPLE 2 may be produced as mentioned in the above example or by ethylation of alkyl-n-propyl malonic acid diamides according to Titherley (loc. cit.).

According to the same methods of working the compounds enumerated in the following table can be prepared.

Table 1 C OH Malonic acids R C 0 OH solubility in: No. R amine B. P. (111111.) form w=water e=ether 1 Calla-OH HN(C7H5)Z 128-130" C. (0.1).-.. l1qu1d w miscible, eeaslly soluble.

v 2 0 ....do l08109 0. (0.25)... solid M. P.6l 0... w easily soluble, e easily soluble. CH3

3 0 .,....do 111112 C. (0.12)... hqmd w soluble, eeaslly soluble. C2115 CH5 4 CHGH' do 118120 C. (0.3 -do w miscible, e miscible.

CH3 5 C-==C do 113114 C. (0.33).-. solid M. P. 4243 w. easily soluble, e easily C. soluble. CH3

CzHa CH3 6 C HN 113115 C. (0.28).... liquid w easily soluble,. e easily 301111316. CzHs CzHs CHsCHq\ 7------ C NH CH5 121-122 C. (0.25).... .....do w 5% soluble, eeasily soluble. CH'aOH'a CH3 8--.--- /C\ ...d0 124125 O. (0.25).... .....do soluble,e easily solue. CHsCHzCHz CH3 9- CH3 0 HN(C H )2 116 O. (0.15).... do w 2%,s0luble, e easily soluble. CH

10---.- 0 do 119-121 C. (0.1).... .do w 34% soluble, e easily Somme. CH3=CH-CH2 CH3\ 11-- CH3 0 HN(CHz-CH=CH2)1 123-125" C. (0.1) -.clo w dificultly so1uble,.e mm

ily soluble. CH2

CzHs

12... 0:0 HN( O2H );4 128 C. (0.25)--.. .---.do w soluble, e soluble.

CzHs

l 13 /C\ .-.--do 128130 C. (0.3) .-r1o w soluble, e easily solue. CH'FC HOH2 CzHs CHzCHa v 14-.." 0 EN OH OH) l5l O. (0.1) .-do w scarcely. soluble, a easily soluble. CHFCEL-CH: CHQCH: 2

CH2=CHCH3\ 15- O HN(G;H5) 152-154 C. (1) -.--.do w dificultly soluble, e easily soluble. GHFOH-CH1 CHFCHK 16"-.. C 5 CC --..do 138-140" C. (0.4)..... solid M. 364 0... w easily soluble, g g asily Soluble CHr-CH Table 1-(Continued) solubility in: No. R amine B. P. (mm.) form w=water c=ether CHr-CHI 17 C=C\ HN(C:H;)1 128 C. (0.28) liquid to soluble, a soluble.

Hr-CHz CH-r-CH: Cg: i8... 0 i C- do 140-142 C. (0.1) do w dglflicultly soluble, e solu e. CHFCH CH -CH, 19---" C 1 CH-ClEh-C -do 135138 C. (0.2) do w soluble, e easily soluble.

urn-cm CH2 7 C io 115-117 0. (0.28).-.- .do w miscible, e easily soluble.

H: CH:CH:\ 21- C do l28l30 C. (0.1) do wmoderetelyso1ubie,eeasily soluble. CHz-CH:

What we claim is: wherein X represents a methylene radical con- 1. The bis-diethyl amide of methyLisopropenyl malonic acid of the formula CIHB (JO-N KL CzHi I CzHs C O-N being a. white crystallised solid of the melting point 48-49 C.

2. The bis-diethyl amide of dimethyl malonic acid of the formula OHi=C CE:

/l C1111 CH CaHl being a white crystallised solid of the melting point 61 C,

3. The bis-diethyiamide of the formula OaHl CON

CIHI

CHIP-CH: CO-N CzHl 4. A dicarboxylic acid diamide of the formula C0-Am i (JO-Am REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,986,854 Reid Jan. 8, 1935 2,182,178 Pinkernelle Dec. 5, 1939 2,192,906 Hanford et a1. Mar. 12, 1940 FOREIGN PATENTS Number Country Date 358,085 France Jan. 26, 1906 OTHER REFERENCES West, J. Chem. Soc. (London), vol.

(1924), pages 710-721.

Naik et al., Chemical Abstracts, vol. 26 (1932), page 93.

Kennedy, J. Chem. Soc. (London) (1932),

pages 2781-2782.

Bush, J. Am. Chem. Soc. vol. 61 (1939), pages 637-638. 

